Graphene ribbons that are only a few atoms wide, so-called graphene nanoribbons, have special electrical properties that make them promising candidates for the nanoelectronics of the future. While graphene, a one-dimensional carbon layer, is a conductive material, it can become a semiconductor in the form of nanoribbons. This means that it has a sufficiently large energy or band gap in which no electron states can exist—it can be turned on and off, and thus may become a key component of nanotransistors.

Via:: https://phys.org/news/2017-11-nanotransistor-graphene-nanoribbons.html

A nanotransistor made of graphene nanoribbons

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